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STOCK BASED COMPENSATION Summary of restricted stock unit activity (Details) (USD $)
In Millions, except Share data in Thousands, unless otherwise specified
12 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2009
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period 4 years      
Restricted Stock Units (RSUs)
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Impact of retaining common stock from employees upon vesting of restricted shares and restricted stock units to cover income tax withholding $ 0.6 $ 0.6    
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]        
Restricted stock units, Restricted Stock Units, Beginning balance 1,296 771 172  
Restricted stock units, Weighted Average Grant-Date Fair Value per Share, Beginning balance $ 4.66 $ 5.72 $ 7.05  
Restricted stock units, Weighted average remaining contractual life (in years), Beginning balance 1 year 1 month 2 days 1 year 4 months 17 days 1 year 4 months 6 days 7 months 28 days
Aggregate intrinsic value, Beginning balance, Restricted stock $ 3,823,000 $ 2,408,000 $ 1,272,000  
Restricted Stock Units, Awarded 1,258 1,122 618  
Weighted Average Grant-Date Fair Value per Share, Awarded $ 2.57 $ 4.34 $ 5.37  
Restricted Stock Units, Released (721) (335) 0  
Weighted Average Grant-Date Fair Value per Share, Released $ 3.99 $ 5.97 $ 0.00  
Restricted Stock Units, Forfeited (147) (262) (19)  
Weighted Average Grant-Date Fair Value per Share, Forfeited $ 3.48 $ 4.68 $ 6.24  
Restricted stock units, Restricted Stock Units, Ending balance 1,686 1,296 771 172
Restricted stock units, Weighted Average Grant-Date Fair Value per Share, Ending balance $ 3.49 $ 4.66 $ 5.72 $ 7.05
Restricted stock units, Weighted average remaining contractual life (in years), Ending balance 1 year 1 month 2 days 1 year 4 months 17 days 1 year 4 months 6 days 7 months 28 days
Aggregate intrinsic value, Ending balance, Restricted stock $ 4,113,000 $ 3,823,000 $ 2,408,000 $ 1,272,000
Maximum | Restricted Stock Units (RSUs)
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period 4 years      
Non-employee Director | Restricted Stock Units (RSUs)
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting percentage after one year 33.3333%      
Vesting percentage after two years 33.3333%      
Vesting percentage after three years 33.3333%      
Annual award vesting percentage 100.00%